Sealing laminated glass and apparatus therefor



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ig' I IIII T. H. P. FARR, JR

Filed April 3, 1928 SEALING LAMINATED GLASS AND APPARATUS THEREFOR Feb.l1, 1930f luloid to the glass.

ing may be eiective and permanent it has' Patented Feb. 11, 1'930 UNITEDSTATES PATENT lOFFICE THOMAS H. POWERS FAn-16, JR., or NEW YORK, N. Y.,Assrenon To TRIPLEX 'SAFETY GLASS COMPANY .0F NORTH AMERICA, DELAWARE AOF NEW YORK, N. Y., A CORPORATION' SEALING' LAMINATED GLASS ANDAPPARATUS THEREFOR application med April a,

'non-brittle material, strongly adherent to the glass on both sides, itis desirable to seal the edges of the compound sheet in order toAprevent the penetration of moisture-or air between the sheets of glass.-The application of a coat of varnish to the edge of the compound sheetis easily accomplished but in the use of the compound sheet the varnishis sometimes worn oli' and air or moisture penetrates betweenv thesheets of glass and affects unfavorably the adhesion of the cel- Inorder that the sealbeen found desirable to clear out the space betweenthe sheets of glass for a slight depth at the edge and to ill thesealing slot so 1 formed with a sealing material or compound which hasno action upon the celluloid or other non-brittle material and is itselfunaii'ected 'by heat, moisture, air, or vibration. The object of thepresent invention is to provide for the rapid and effective introductionof the sealing material or compound into the sealing slot aftertheformation of the compound sheet has been completed and the sealing slothas been cleared out.A In accordance l with the invention the compoundor' laminated sheet, with the sealingislot cleared out, is subjected toa vacuum foLthe purpose of reducing as low as practicable the pressurein the sealing slot and the sealing material, maintained in a fiuidcondition by heat, is

.then permitted to-ill the sealing slot, while the pressure in the slotis at a minimum, pressure being applied also to the sealing material ifnecessary to aid the flow of the sealing material into the slot.` Underthe influence of the vacuum and of the capillary action of the very thinsealing slot the sealing material ills the slot to the bottom. Thecharacter of the sealing material is such that it chills and hardensquickly by contact with the relatively cooler glass so that the glasscan bev removed immediately without loss of' sealing materialfrom thesealing slot. The invention will be explained more fully here- 1928.serial No. 266,919.

inafter with reference to the accompanying drawing in which igure l is aview in longitudinal, vertical section, of an apparatus adapted for thepractice of the method of sealing herein referred to, and

Figure 2 is a view of the same in transverse section. y

The compound or laminated sheet which is to be sealed is shown asconsisting of two sheets a of glass, with an interposed sheet ofCelluloid or equivalent non-brittle material which, by -methodsnotnecessary to be described herein, is made strongly adherent on bothsides to the glass. .When this compound or laminated sheet is inreadiness for sealing it has at its edge, between the two sheets ofglass, as at c, a recess which is called for convenience a sealing slot,formed by the` omission or removal of, the intersheet b forl a slightdepth, possibly one-quarter of an inch, and quitenarrow, depending uponthe thickness of the celluloid or non-brittle sheet The apparatus shownin the drawing for the practice of the method herein referred' to,comprises a tank cl which has an enclosed sealing chamber e and a supplychamber f for the sealing material, which` may be kept in a suitablyfluid condition by al heating ldevice g. l/Vithin the sealing chaxpbere, preferably near its top, is a table gto receive the laminated sheeta, I), which is to be sealed .at its edge. Preferably the table is atleast as large as the glass to be sealed and leaves the A edge of theglass exposed all around but without exposing either face of the glass.The top of the sealing chamber receives a removable lid or cover 'e1which fits tightly within the opening in the top and is held tightlyinposition by suitable clamping devices e2. The lid or cover conforms in'The sealing chamber is connected through a hand controlled valve e3 anda suitable connection e4 with a suctlon devlce of any sultsuit-ablyfluid condition, with its level in the sealing chamber e slightly belowthe to of the table g, the laminated glass is place on the table and thelid e1 is ap lied and secured tightly into place. Then, tiiro'ugh thevalve controlled connection e3, e4 the air in the sealing chamber isexhausted as far as practicable, the pressure in the sealing slot beingthus reduced to a minimum. As the next step the sealing material, in itsfluid condition, is permitted to enter the sealing slot. This isaccomplished by openinfr the valve f2, which controls the connectionbetween the supply chamber and the sealing slot.' The sealing material,under the infiuence of the vacuum, assisted, it may be, by the su ply ofadditional pressure onthe surface o `the sealing material in the supplychamber f, floods the exposed edges of the laminated sheet andpenetrates the sealing slot to the bottom, completely filling the same.The sealing material in the slot chills and hardens immediatelyandthefiuid sealing material is allowed to resume its normal level throuffhthe closing of the exhaust'valve e3 and tie opening of the vent f5, thesurface of the sealing material in the sealing chamber falling below thelevel of the top of the table g. The valve f2 is then closed after whichthe laminated sheet is removed at once and replaced by another, thedescribed operations being repeated in quick succession.

I elaim as my invention:

1. An apparatus for sealigng laminated glass with a sealing slot in itsedge, which comprises a sealing chamber, a table in the sealing chamberto support the glass, means to exhaust the air from the sealing chamberand the sealing slot, and means to cause fluid sealing material to enterthe sealing chamber and immerse the sealing slot.

2. An apparatus for sealing laminated glass with a sealing slot in itsedge, which comprises a sealing chamber, a table in the sealing chamber`to support the glass, means to exhaust the air from the sealing chamberand the sealing slot, a supply chamber for sealing material, a valve.controlled connection between the supply chamber and the sealingchamber, and means to cause sealing material in a fiuid state to enterthe sealing chamber under pressure.

3. The method of filling with sealing material a slot in the edge oflaminated glass, which comprises reducing the air pressure 1n thesealing slot and immersing the glass uum, sup lying fluid sealing mediumto the edge of tie glass andthe sealing slot While still in a vacuum,and applying pressure to the sealing material.

March, A. D. 1928.

THOMAS H. PWERS FARB, JR,

This specification signed this 30th day of

